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Why Does the Automatic Transmission Make Noise When Releasing the Foot Brake?

4 Answers
MacStephanie
07/24/25 4:03pm

Automatic transmission vehicles may produce abnormal noises when releasing the foot brake during startup for the following reasons: 1. Slow Brake Release: This noise primarily occurs when the brake is released too slowly during startup, a common issue among many automatic transmission owners. When the brake pedal is gradually released, the engine already has sufficient power to propel the vehicle forward, but the brake hasn't been fully disengaged. As a result, the moving wheels are held back by the braking system, naturally causing abnormal noises. The solution is to release the brake more quickly next time. 2. Brake Disc and Pad Corrosion Sticking: This usually happens after driving in rainy weather and then leaving the car unused for several days. The brake disc and pad may corrode and stick together, leading to noise upon restarting. Applying butter or specialized lubricant at the connection between the brake pad and caliper at a repair shop can resolve this issue. 3. Metallic Sounds: Many modern brake pads are made of semi-metallic materials containing a large amount of metal fibers, which can sometimes form metal particles. These particles may produce a screeching sound when the brake is applied or released. This condition typically disappears after driving for a while. If the noise persists, it may indicate poor manufacturing quality, and it's advisable to replace the brake pads promptly to avoid damaging the brake disc.

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JakeAnn
08/10/25 7:37am

As a regular car owner who drives frequently, I've encountered the issue of hearing noises when releasing the brake during automatic transmission starts several times. These sounds are mostly squeaks or clicks, and the reason is quite simple: when parked, the brake discs and pads may slightly stick together, especially during cold starts or in humid conditions, causing a friction sound when released. Sometimes, the ABS system initiates a self-check, which can also produce a brief noise. Don't worry, it doesn't affect driving safety, but it's more likely to occur on rainy days. It's recommended to lightly press the brake a few times to warm up the components and avoid parking in areas with standing water. While not addressing it long-term won't directly damage the car, louder noises might indicate aging brake components, so it's best to schedule regular basic maintenance. Daily driving habits are also important; avoid abruptly releasing the brake when starting—gentle and smooth operation can reduce the occurrence of this issue.

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DeConnor
09/25/25 7:57am

As an experienced driver with years of driving experience, the noise when releasing the brake is indeed common. The main reasons include incomplete release of the brake system, the friction sound when the brake disc and brake pads separate after sticking, and slight vibrations during transmission engagement. If the noise is brief and occurs only once during startup, it is generally normal. However, if it persists or is sharp, it may indicate a stuck brake caliper or component wear. Key inspection points include checking brake pad thickness and air humidity, as humid conditions can increase the likelihood of this issue. Operationally, I recommend gently pressing the accelerator first, then smoothly releasing the brake to minimize noise. Regular maintenance of brake fluid and cleaning of components can prevent major problems. In conclusion, don't underestimate these sounds—though minor, they can signal potential hidden issues.

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OIker
11/09/25 3:17am

As someone who knows a bit about cars, the sound when releasing the foot brake in an automatic transmission is usually caused by slight adhesion of the brake discs and pads after parking, creating friction noise upon release. It may also occur during ABS self-check or transmission shifting. This is commonly observed during cold starts or hill starts. The solution is to lightly press the brake before starting to release pressure, or warm up the car for a few minutes. If the noise occurs frequently, have the brake components checked to prevent rust accumulation. Simple maintenance can easily resolve this issue.

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